Bug 2559937

Summary:	CVE-2026-93601 ntpd-rs: rustls-webpki: Name Constraint Bypass in wildcard certificate validation [epel-all]
Product:	[Fedora] Fedora EPEL	Reporter:	Ronit Dey <rdey>
Component:	ntpd-rs	Assignee:	Fabio Valentini <decathorpe>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	epel10	CC:	decathorpe, rust-sig
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["94568926-7455-4c8f-8f71-63ce67f08abb"]}
Fixed In Version:	ntpd-rs-1.7.2-3.el10_3 ntpd-rs-1.7.2-3.el10_4 ntpd-rs-1.7.2-3.el10_2	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-10-27 00:33:31 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2538656

Description Ronit Dey 2026-10-23 15:31:45 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

rustls-webpki (the Rust webpki fork used by rustls) versions >= 0.101.0 and prior to 0.103.12 and 0.104.0-alpha.6 incorrectly accepted permitted-subtree DNS name constraints for certificates asserting a wildcard name. For example, a name constraint of accept.example.com was treated as satisfied by a certificate for *.example.com, which could feasibly assert reject.example.com — a name outside the permitted subtree. Because name constraints are restrictions applied to otherwise properly issued certificates, the issue is only reachable after signature verification succeeds and requires a misissued wildcard certificate to exploit.

Comment 1 Fedora Update System 2026-10-24 15:23:55 UTC

FEDORA-EPEL-2026-997c3eec6e (ntpd-rs-1.7.2-3.el10_2) has been submitted as an update to Fedora EPEL 10.2.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-997c3eec6e

Comment 2 Fedora Update System 2026-10-24 15:24:03 UTC

FEDORA-EPEL-2026-3e71d1624f (ntpd-rs-1.7.2-3.el10_4) has been submitted as an update to Fedora EPEL 10.4.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-3e71d1624f

Comment 3 Fedora Update System 2026-10-24 15:24:04 UTC

FEDORA-EPEL-2026-99a4ebafd3 (ntpd-rs-1.7.2-3.el10_3) has been submitted as an update to Fedora EPEL 10.3.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-99a4ebafd3

Comment 4 Fedora Update System 2026-10-25 02:33:44 UTC

FEDORA-EPEL-2026-997c3eec6e has been pushed to the Fedora EPEL 10.2 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-997c3eec6e

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 5 Fedora Update System 2026-10-25 02:34:12 UTC

FEDORA-EPEL-2026-99a4ebafd3 has been pushed to the Fedora EPEL 10.3 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-99a4ebafd3

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 6 Fedora Update System 2026-10-25 02:35:03 UTC

FEDORA-EPEL-2026-3e71d1624f has been pushed to the Fedora EPEL 10.4 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-3e71d1624f

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 7 Fedora Update System 2026-10-27 00:33:31 UTC

FEDORA-EPEL-2026-99a4ebafd3 (ntpd-rs-1.7.2-3.el10_3) has been pushed to the Fedora EPEL 10.3 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 8 Fedora Update System 2026-11-02 01:11:42 UTC

FEDORA-EPEL-2026-3e71d1624f (ntpd-rs-1.7.2-3.el10_4) has been pushed to the Fedora EPEL 10.4 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 9 Fedora Update System 2026-11-02 01:40:51 UTC

FEDORA-EPEL-2026-997c3eec6e (ntpd-rs-1.7.2-3.el10_2) has been pushed to the Fedora EPEL 10.2 stable repository.
If problem still persists, please make note of it in this bug report.